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  • 1.
    Geng, Zeyang
    et al.
    Chalmers Univ Technol, Div Elect Power Engn, Dept Elect Engn, S-41296 Gothenburg, Sweden..
    Wang, Siyang
    Umea Univ, Dept Math & Math Stat, S-90187 Umea, Sweden.;Malardalen Univ, UKK, Div Math & Phys, S-72123 Vasteras, Sweden..
    Lacey, Matthew J.
    Scania CV AB, S-15187 Sodertalje, Sweden..
    Brandell, Daniel
    Uppsala Univ, Angstrom Lab, Dept Chem, Box 538, S-75121 Uppsala, Sweden..
    Thiringer, Torbjorn
    Chalmers Univ Technol, Div Elect Power Engn, Dept Elect Engn, S-41296 Gothenburg, Sweden..
    Bridging physics-based and equivalent circuit models for lithium-ion batteries2021Ingår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 372, artikel-id 137829Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this article, a novel implementation of a widely used pseudo-two-dimensional (P2D) model for lithium-ion battery simulation is presented with a transmission line circuit structure. This implementation represents an interplay between physical and equivalent circuit models. The discharge processes of an LiNi0.33Mn0.33Co0.33O2-graphite lithium-ion battery under different currents are simulated, and it is seen the results from the circuit model agree well with the results obtained from a physical simulation carried out in COMSOL Multiphysics, including both terminal voltage and concentration distributions. Finally we demonstrated how the circuit model can contribute to the understanding of the cell electrochemistry, exemplified by an analysis of the overpotential contributions by various processes. 

  • 2.
    Kostela, Johan
    et al.
    Uppsala Universitet.
    Elmgren, Maja
    Uppsala Universitet.
    Almgren, Mats
    Uppsala Universitet.
    Electrochemical properties and diffusion of a redox active surfactant incorporated in bicontinuous cubic and lamellar phase2005Ingår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 50, nr 16-17, s. 3333-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The objective of this study was to investigate the electrochemical behaviour of the divalent redox active surfactant, N-cetyl-N′-methylviologen (CMV), in bicontinuous cubic and lamellar phases. The liquid crystalline phases were prepared from the system glycerolmonooleate (GMO)–water (and brine)–cationic surfactant. A comparison of the phase behaviour of GMO with the monovalent cetyltrimethylammonium bromide (CTAB) and the divalent CMV surfactant showed that the surfactants gave about the same effect at the same surface charge density. The electrochemical measurements were made with a mixture of CTAB and CMV as the surfactant. Cyclic voltammetry was used to study the electrochemistry of CMV incorporated in the cubic and lamellar phases that were spread on a gold electrode. The E0-values in the cubic samples were more negative (−0.55 V versus SCE) than in the lamellar samples (−0.53 V versus SCE). This can be explained by the higher charge density in the lamellar phase. The diffusion coefficients were also measured in the cubic phase. The mass transport is slowed down about fifty times in the cubic phase compared to in the pure electrolyte. The concentration dependence on the diffusion coefficient was also investigated. No electron hopping could be observed, which suggest that diffusional movement of the redox probe is the main source of charge transport. By placing the samples on a conducting glass slide, spectroelectrochemical investigations were performed. In the lamellar phase strong dimerization was detected at high concentration of viologen, but much less in the cubic phase.

  • 3.
    Kostela, Johan
    et al.
    Uppsala universitet, Fysikalisk-kemiska institutionen.
    Elmgren, Maja
    Uppsala universitet, Fysikalisk-kemiska institutionen.
    Almgren, Mats
    Electrochemistry and diffusion of a redox active surfactant in bicontinuous cubic and lamellar phase2005Ingår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 50, nr 16-17, s. 3333-3340Artikel i tidskrift (Refereegranskat)
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